[pjc50]

In physical hardware you can get "real" noise out of a single diode with appropriate processing. https://www.maximintegrated.com/en/app-notes/index.mvp/id/34...

The effect is a true quantum process whereby one electron tunneling across the junction triggers a large number of other electrons into moving.

[neltnerb]

Nice! I see the noise spectra, I am guessing the long tail out at high frequencies means that the recovery time is short enough that subsequent bits aren't correlated?